Aegon the Conqueror is a fabled figure in Game of Thrones and House of the Dragon, known as the Targaryen, who arrived from Valyria and forced the great houses of Westeros to their knees. A prequel about Aegon's conquest was written by screenwriters Rand Ravich and Far Shariat (via ). The script apparently portrayed Aegon as a drunken ruffian, something he'd never been described as in the books. The pitch was rejected, though has since revealed another attempt at the story is being worked on. An after House of the Dragon.
Referenced several times in Game of Thrones as one of the lowest-income areas of King's Landing, Flea Bottom is the home of Davos Seaworth and Gendry. A series based on life in the slum was discussed at one point, though it was reported as not moving forward as of July 2021 (via ). Pitches attempted to explore several different angles of the Game of Thrones universe, though it's not entirely surprising the Flea Bottom show didn't have the traction to progress forward.
Not to be confused with Arya's direwolf or Jessica Henwick's Nymeria Sand from Game of Thrones, Princess Nymeria of Ny Sar was a Dornish warrior queen who lived centuries before
was a chain of volcanic eruptions that destroyed the thriving city of Valyria in Essos. Old Valyria is mentioned several times throughout Game of Thrones and House of the Dragon as the home of the Targaryen family and a city ruled by dragon riders. The fabled Valyria would've been exciting to see on screen in a story of characters unknowingly existing just before their deaths at the hands of a cataclysmic event.
The Faith of the Seven is one of the that is mentioned frequently in the two series. One of the far-fetched pitches for a prequel was about the fabled Seven Gods, as if they were real people roaming the world, showing how they came to be worshiped (via ). The idea didn't make it too far and likely wouldn't have had the traction to follow up the original series.
The next Game of Thrones, which will adapt the novellas commonly called The Tales of Dunk and Egg. The story follows the fabled Lord Commander of the Kingsguard, Ser Duncan the Tall, and King Aegon V Targaryen, also known as Egg, in their early days, adventuring around Westeros. HBO initially passed on adapting the series (via ), but it's now planned to be the third TV series in the universe, taking a less complex, light-hearted approach to the universe.
